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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics.Tracing;
using System.Runtime.CompilerServices;
namespace System.Threading.Tasks
{
/// <summary>Provides an event source for tracing TPL information.</summary>
[EventSource(
Name = "System.Threading.Tasks.TplEventSource",
Guid = "2e5dba47-a3d2-4d16-8ee0-6671ffdcd7b5"
)]
[EventSourceAutoGenerate]
internal sealed partial class TplEventSource : EventSource
{
private const string EventSourceSuppressMessage = "Parameters to this method are primitive and are trimmer safe";
/// Used to determine if tasks should generate Activity IDs for themselves
internal bool TasksSetActivityIds; // This keyword is set
internal bool Debug;
private bool DebugActivityId;
private const int DefaultAppDomainID = 1;
/// <summary>
/// Get callbacks when the ETW sends us commands`
/// </summary>
protected override void OnEventCommand(EventCommandEventArgs command)
{
if (IsEnabled(EventLevel.Informational, Keywords.TasksFlowActivityIds))
ActivityTracker.Instance.Enable();
else
TasksSetActivityIds = IsEnabled(EventLevel.Informational, Keywords.TasksSetActivityIds);
Debug = IsEnabled(EventLevel.Informational, Keywords.Debug);
DebugActivityId = IsEnabled(EventLevel.Informational, Keywords.DebugActivityId);
}
/// <summary>
/// Defines the singleton instance for the TPL ETW provider.
/// </summary>
public static readonly TplEventSource Log = new TplEventSource();
// Parameterized constructor to block initialization and ensure the EventSourceGenerator is creating the default constructor
// as you can't make a constructor partial.
private TplEventSource(int _) { }
/// <summary>Configured behavior of a task wait operation.</summary>
public enum TaskWaitBehavior : int
{
/// <summary>A synchronous wait.</summary>
Synchronous = 1,
/// <summary>An asynchronous await.</summary>
Asynchronous = 2
}
/// <summary>ETW tasks that have start/stop events.</summary>
public static class Tasks // this name is important for EventSource
{
/// <summary>A parallel loop.</summary>
public const EventTask Loop = (EventTask)1;
/// <summary>A parallel invoke.</summary>
public const EventTask Invoke = (EventTask)2;
/// <summary>Executing a Task.</summary>
public const EventTask TaskExecute = (EventTask)3;
/// <summary>Waiting on a Task.</summary>
public const EventTask TaskWait = (EventTask)4;
/// <summary>A fork/join task within a loop or invoke.</summary>
public const EventTask ForkJoin = (EventTask)5;
/// <summary>A task is scheduled to execute.</summary>
public const EventTask TaskScheduled = (EventTask)6;
/// <summary>An await task continuation is scheduled to execute.</summary>
public const EventTask AwaitTaskContinuationScheduled = (EventTask)7;
/// <summary>AsyncCausalityFunctionality.</summary>
public const EventTask TraceOperation = (EventTask)8;
public const EventTask TraceSynchronousWork = (EventTask)9;
}
public static class Keywords // this name is important for EventSource
{
/// <summary>
/// Only the most basic information about the workings of the task library
/// This sets activity IDS and logs when tasks are schedules (or waits begin)
/// But are otherwise silent
/// </summary>
public const EventKeywords TaskTransfer = (EventKeywords)1;
/// <summary>
/// TaskTranser events plus events when tasks start and stop
/// </summary>
public const EventKeywords Tasks = (EventKeywords)2;
/// <summary>
/// Events associted with the higher level parallel APIs
/// </summary>
public const EventKeywords Parallel = (EventKeywords)4;
/// <summary>
/// These are relatively verbose events that effectively just redirect
/// the windows AsyncCausalityTracer to ETW
/// </summary>
public const EventKeywords AsyncCausalityOperation = (EventKeywords)8;
public const EventKeywords AsyncCausalityRelation = (EventKeywords)0x10;
public const EventKeywords AsyncCausalitySynchronousWork = (EventKeywords)0x20;
/// <summary>
/// Emit the stops as well as the schedule/start events
/// </summary>
public const EventKeywords TaskStops = (EventKeywords)0x40;
/// <summary>
/// TasksFlowActivityIds indicate that activity ID flow from one task
/// to any task created by it.
/// </summary>
public const EventKeywords TasksFlowActivityIds = (EventKeywords)0x80;
/// <summary>
/// Events related to the happenings of async methods.
/// </summary>
public const EventKeywords AsyncMethod = (EventKeywords)0x100;
/// <summary>
/// TasksSetActivityIds will cause the task operations to set Activity Ids
/// This option is incompatible with TasksFlowActivityIds flow is ignored
/// if that keyword is set. This option is likely to be removed in the future
/// </summary>
public const EventKeywords TasksSetActivityIds = (EventKeywords)0x10000;
/// <summary>
/// Relatively Verbose logging meant for debugging the Task library itself. Will probably be removed in the future
/// </summary>
public const EventKeywords Debug = (EventKeywords)0x20000;
/// <summary>
/// Relatively Verbose logging meant for debugging the Task library itself. Will probably be removed in the future
/// </summary>
public const EventKeywords DebugActivityId = (EventKeywords)0x40000;
}
//-----------------------------------------------------------------------------------
//
// TPL Event IDs (must be unique)
//
/// <summary>A task is scheduled to a task scheduler.</summary>
private const int TASKSCHEDULED_ID = 7;
/// <summary>A task is about to execute.</summary>
private const int TASKSTARTED_ID = 8;
/// <summary>A task has finished executing.</summary>
private const int TASKCOMPLETED_ID = 9;
/// <summary>A wait on a task is beginning.</summary>
private const int TASKWAITBEGIN_ID = 10;
/// <summary>A wait on a task is ending.</summary>
private const int TASKWAITEND_ID = 11;
/// <summary>A continuation of a task is scheduled.</summary>
private const int AWAITTASKCONTINUATIONSCHEDULED_ID = 12;
/// <summary>A continuation of a taskWaitEnd is complete </summary>
private const int TASKWAITCONTINUATIONCOMPLETE_ID = 13;
/// <summary>A continuation of a taskWaitEnd is complete </summary>
private const int TASKWAITCONTINUATIONSTARTED_ID = 19;
private const int TRACEOPERATIONSTART_ID = 14;
private const int TRACEOPERATIONSTOP_ID = 15;
private const int TRACEOPERATIONRELATION_ID = 16;
private const int TRACESYNCHRONOUSWORKSTART_ID = 17;
private const int TRACESYNCHRONOUSWORKSTOP_ID = 18;
//-----------------------------------------------------------------------------------
//
// Task Events
//
// These are all verbose events, so we need to call IsEnabled(EventLevel.Verbose, ALL_KEYWORDS)
// call. However since the IsEnabled(l,k) call is more expensive than IsEnabled(), we only want
// to incur this cost when instrumentation is enabled. So the Task codepaths that call these
// event functions still do the check for IsEnabled()
#region TaskScheduled
/// <summary>
/// Fired when a task is queued to a TaskScheduler.
/// </summary>
/// <param name="OriginatingTaskSchedulerID">The scheduler ID.</param>
/// <param name="OriginatingTaskID">The task ID.</param>
/// <param name="TaskID">The task ID.</param>
/// <param name="CreatingTaskID">The task ID</param>
/// <param name="TaskCreationOptions">The options used to create the task.</param>
/// <param name="appDomain">The ID for the current AppDomain.</param>
[UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:UnrecognizedReflectionPattern",
Justification = EventSourceSuppressMessage)]
[Event(TASKSCHEDULED_ID, Task = Tasks.TaskScheduled, Version = 1, Opcode = EventOpcode.Send,
Level = EventLevel.Informational, Keywords = Keywords.TaskTransfer | Keywords.Tasks,
Message = "Task {2} scheduled to TaskScheduler {0}.")]
public void TaskScheduled(
int OriginatingTaskSchedulerID, int OriginatingTaskID, // PFX_COMMON_EVENT_HEADER
int TaskID, int CreatingTaskID, int TaskCreationOptions, int appDomain = DefaultAppDomainID)
{
// IsEnabled() call is an inlined quick check that makes this very fast when provider is off
if (IsEnabled() && IsEnabled(EventLevel.Informational, Keywords.TaskTransfer | Keywords.Tasks))
{
unsafe
{
EventData* eventPayload = stackalloc EventData[6];
eventPayload[0].Size = sizeof(int);
eventPayload[0].DataPointer = ((IntPtr)(&OriginatingTaskSchedulerID));
eventPayload[0].Reserved = 0;
eventPayload[1].Size = sizeof(int);
eventPayload[1].DataPointer = ((IntPtr)(&OriginatingTaskID));
eventPayload[1].Reserved = 0;
eventPayload[2].Size = sizeof(int);
eventPayload[2].DataPointer = ((IntPtr)(&TaskID));
eventPayload[2].Reserved = 0;
eventPayload[3].Size = sizeof(int);
eventPayload[3].DataPointer = ((IntPtr)(&CreatingTaskID));
eventPayload[3].Reserved = 0;
eventPayload[4].Size = sizeof(int);
eventPayload[4].DataPointer = ((IntPtr)(&TaskCreationOptions));
eventPayload[4].Reserved = 0;
eventPayload[5].Size = sizeof(int);
eventPayload[5].DataPointer = ((IntPtr)(&appDomain));
eventPayload[5].Reserved = 0;
if (TasksSetActivityIds)
{
Guid childActivityId = CreateGuidForTaskID(TaskID);
WriteEventWithRelatedActivityIdCore(TASKSCHEDULED_ID, &childActivityId, 6, eventPayload);
}
else
WriteEventCore(TASKSCHEDULED_ID, 6, eventPayload);
}
}
}
#endregion
#region TaskStarted
/// <summary>
/// Fired just before a task actually starts executing.
/// </summary>
/// <param name="OriginatingTaskSchedulerID">The scheduler ID.</param>
/// <param name="OriginatingTaskID">The task ID.</param>
/// <param name="TaskID">The task ID.</param>
[Event(TASKSTARTED_ID,
Level = EventLevel.Informational, Keywords = Keywords.Tasks,
Message = "Task {2} executing.")]
public void TaskStarted(
int OriginatingTaskSchedulerID, int OriginatingTaskID, // PFX_COMMON_EVENT_HEADER
int TaskID)
{
if (IsEnabled(EventLevel.Informational, Keywords.Tasks))
WriteEvent(TASKSTARTED_ID, OriginatingTaskSchedulerID, OriginatingTaskID, TaskID);
}
#endregion
#region TaskCompleted
/// <summary>
/// Fired right after a task finished executing.
/// </summary>
/// <param name="OriginatingTaskSchedulerID">The scheduler ID.</param>
/// <param name="OriginatingTaskID">The task ID.</param>
/// <param name="TaskID">The task ID.</param>
/// <param name="IsExceptional">Whether the task completed due to an error.</param>
[UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:UnrecognizedReflectionPattern",
Justification = EventSourceSuppressMessage)]
[Event(TASKCOMPLETED_ID, Version = 1,
Level = EventLevel.Informational, Keywords = Keywords.TaskStops,
Message = "Task {2} completed.")]
public void TaskCompleted(
int OriginatingTaskSchedulerID, int OriginatingTaskID, // PFX_COMMON_EVENT_HEADER
int TaskID, bool IsExceptional)
{
if (IsEnabled() && IsEnabled(EventLevel.Informational, Keywords.Tasks))
{
unsafe
{
EventData* eventPayload = stackalloc EventData[4];
int isExceptionalInt = IsExceptional ? 1 : 0;
eventPayload[0].Size = sizeof(int);
eventPayload[0].DataPointer = ((IntPtr)(&OriginatingTaskSchedulerID));
eventPayload[0].Reserved = 0;
eventPayload[1].Size = sizeof(int);
eventPayload[1].DataPointer = ((IntPtr)(&OriginatingTaskID));
eventPayload[1].Reserved = 0;
eventPayload[2].Size = sizeof(int);
eventPayload[2].DataPointer = ((IntPtr)(&TaskID));
eventPayload[2].Reserved = 0;
eventPayload[3].Size = sizeof(int);
eventPayload[3].DataPointer = ((IntPtr)(&isExceptionalInt));
eventPayload[3].Reserved = 0;
WriteEventCore(TASKCOMPLETED_ID, 4, eventPayload);
}
}
}
#endregion
#region TaskWaitBegin
/// <summary>
/// Fired when starting to wait for a taks's completion explicitly or implicitly.
/// </summary>
/// <param name="OriginatingTaskSchedulerID">The scheduler ID.</param>
/// <param name="OriginatingTaskID">The task ID.</param>
/// <param name="TaskID">The task ID.</param>
/// <param name="Behavior">Configured behavior for the wait.</param>
/// <param name="ContinueWithTaskID">
/// If known, if 'TaskID' has a 'continueWith' task, mention give its ID here.
/// 0 means unknown. This allows better visualization of the common sequential chaining case.
/// </param>
[UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:UnrecognizedReflectionPattern",
Justification = EventSourceSuppressMessage)]
[Event(TASKWAITBEGIN_ID, Version = 3, Task = Tasks.TaskWait, Opcode = EventOpcode.Send,
Level = EventLevel.Informational, Keywords = Keywords.TaskTransfer | Keywords.Tasks,
Message = "Beginning wait ({3}) on Task {2}.")]
public void TaskWaitBegin(
int OriginatingTaskSchedulerID, int OriginatingTaskID, // PFX_COMMON_EVENT_HEADER
int TaskID, TaskWaitBehavior Behavior, int ContinueWithTaskID)
{
if (IsEnabled() && IsEnabled(EventLevel.Informational, Keywords.TaskTransfer | Keywords.Tasks))
{
unsafe
{
EventData* eventPayload = stackalloc EventData[5];
eventPayload[0].Size = sizeof(int);
eventPayload[0].DataPointer = ((IntPtr)(&OriginatingTaskSchedulerID));
eventPayload[0].Reserved = 0;
eventPayload[1].Size = sizeof(int);
eventPayload[1].DataPointer = ((IntPtr)(&OriginatingTaskID));
eventPayload[1].Reserved = 0;
eventPayload[2].Size = sizeof(int);
eventPayload[2].DataPointer = ((IntPtr)(&TaskID));
eventPayload[2].Reserved = 0;
eventPayload[3].Size = sizeof(int);
eventPayload[3].DataPointer = ((IntPtr)(&Behavior));
eventPayload[3].Reserved = 0;
eventPayload[4].Size = sizeof(int);
eventPayload[4].DataPointer = ((IntPtr)(&ContinueWithTaskID));
eventPayload[4].Reserved = 0;
if (TasksSetActivityIds)
{
Guid childActivityId = CreateGuidForTaskID(TaskID);
WriteEventWithRelatedActivityIdCore(TASKWAITBEGIN_ID, &childActivityId, 5, eventPayload);
}
else
{
WriteEventCore(TASKWAITBEGIN_ID, 5, eventPayload);
}
}
}
}
#endregion
/// <summary>
/// Fired when the wait for a tasks completion returns.
/// </summary>
/// <param name="OriginatingTaskSchedulerID">The scheduler ID.</param>
/// <param name="OriginatingTaskID">The task ID.</param>
/// <param name="TaskID">The task ID.</param>
[Event(TASKWAITEND_ID,
Level = EventLevel.Verbose, Keywords = Keywords.Tasks,
Message = "Ending wait on Task {2}.")]
public void TaskWaitEnd(
int OriginatingTaskSchedulerID, int OriginatingTaskID, // PFX_COMMON_EVENT_HEADER
int TaskID)
{
// Log an event if indicated.
if (IsEnabled() && IsEnabled(EventLevel.Verbose, Keywords.Tasks))
WriteEvent(TASKWAITEND_ID, OriginatingTaskSchedulerID, OriginatingTaskID, TaskID);
}
/// <summary>
/// Fired when the work (method) associated with a TaskWaitEnd completes
/// </summary>
/// <param name="TaskID">The task ID.</param>
[Event(TASKWAITCONTINUATIONCOMPLETE_ID,
Level = EventLevel.Verbose, Keywords = Keywords.TaskStops)]
public void TaskWaitContinuationComplete(int TaskID)
{
// Log an event if indicated.
if (IsEnabled() && IsEnabled(EventLevel.Verbose, Keywords.TaskStops))
WriteEvent(TASKWAITCONTINUATIONCOMPLETE_ID, TaskID);
}
/// <summary>
/// Fired when the work (method) associated with a TaskWaitEnd completes
/// </summary>
/// <param name="TaskID">The task ID.</param>
[Event(TASKWAITCONTINUATIONSTARTED_ID,
Level = EventLevel.Verbose, Keywords = Keywords.Tasks)]
public void TaskWaitContinuationStarted(int TaskID)
{
// Log an event if indicated.
if (IsEnabled() && IsEnabled(EventLevel.Verbose, Keywords.Tasks))
WriteEvent(TASKWAITCONTINUATIONSTARTED_ID, TaskID);
}
/// <summary>
/// Fired when an asynchronous continuation for a task is scheduled
/// </summary>
/// <param name="OriginatingTaskSchedulerID">The scheduler ID.</param>
/// <param name="OriginatingTaskID">The task ID.</param>
/// <param name="ContinueWithTaskId">The ID of the continuation object.</param>
[UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:UnrecognizedReflectionPattern",
Justification = EventSourceSuppressMessage)]
[Event(AWAITTASKCONTINUATIONSCHEDULED_ID, Task = Tasks.AwaitTaskContinuationScheduled, Opcode = EventOpcode.Send,
Level = EventLevel.Informational, Keywords = Keywords.TaskTransfer | Keywords.Tasks)]
public void AwaitTaskContinuationScheduled(
int OriginatingTaskSchedulerID, int OriginatingTaskID, // PFX_COMMON_EVENT_HEADER
int ContinueWithTaskId)
{
if (IsEnabled() && IsEnabled(EventLevel.Informational, Keywords.TaskTransfer | Keywords.Tasks))
{
unsafe
{
EventData* eventPayload = stackalloc EventData[3];
eventPayload[0].Size = sizeof(int);
eventPayload[0].DataPointer = ((IntPtr)(&OriginatingTaskSchedulerID));
eventPayload[0].Reserved = 0;
eventPayload[1].Size = sizeof(int);
eventPayload[1].DataPointer = ((IntPtr)(&OriginatingTaskID));
eventPayload[1].Reserved = 0;
eventPayload[2].Size = sizeof(int);
eventPayload[2].DataPointer = ((IntPtr)(&ContinueWithTaskId));
eventPayload[2].Reserved = 0;
if (TasksSetActivityIds)
{
Guid continuationActivityId = CreateGuidForTaskID(ContinueWithTaskId);
WriteEventWithRelatedActivityIdCore(AWAITTASKCONTINUATIONSCHEDULED_ID, &continuationActivityId, 3, eventPayload);
}
else
WriteEventCore(AWAITTASKCONTINUATIONSCHEDULED_ID, 3, eventPayload);
}
}
}
[UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:UnrecognizedReflectionPattern",
Justification = EventSourceSuppressMessage)]
[Event(TRACEOPERATIONSTART_ID, Version = 1,
Level = EventLevel.Informational, Keywords = Keywords.AsyncCausalityOperation)]
public void TraceOperationBegin(int TaskID, string OperationName, long RelatedContext)
{
if (IsEnabled() && IsEnabled(EventLevel.Informational, Keywords.AsyncCausalityOperation))
{
unsafe
{
fixed (char* operationNamePtr = OperationName)
{
EventData* eventPayload = stackalloc EventData[3];
eventPayload[0].Size = sizeof(int);
eventPayload[0].DataPointer = ((IntPtr)(&TaskID));
eventPayload[0].Reserved = 0;
eventPayload[1].Size = ((OperationName.Length + 1) * 2);
eventPayload[1].DataPointer = ((IntPtr)operationNamePtr);
eventPayload[1].Reserved = 0;
eventPayload[2].Size = sizeof(long);
eventPayload[2].DataPointer = ((IntPtr)(&RelatedContext));
eventPayload[2].Reserved = 0;
WriteEventCore(TRACEOPERATIONSTART_ID, 3, eventPayload);
}
}
}
}
[Event(TRACEOPERATIONRELATION_ID, Version = 1,
Level = EventLevel.Informational, Keywords = Keywords.AsyncCausalityRelation)]
public void TraceOperationRelation(int TaskID, CausalityRelation Relation)
{
if (IsEnabled() && IsEnabled(EventLevel.Informational, Keywords.AsyncCausalityRelation))
WriteEvent(TRACEOPERATIONRELATION_ID, TaskID, (int)Relation); // optimized overload for this exists
}
[Event(TRACEOPERATIONSTOP_ID, Version = 1,
Level = EventLevel.Informational, Keywords = Keywords.AsyncCausalityOperation)]
public void TraceOperationEnd(int TaskID, AsyncCausalityStatus Status)
{
if (IsEnabled() && IsEnabled(EventLevel.Informational, Keywords.AsyncCausalityOperation))
WriteEvent(TRACEOPERATIONSTOP_ID, TaskID, (int)Status); // optimized overload for this exists
}
[Event(TRACESYNCHRONOUSWORKSTART_ID, Version = 1,
Level = EventLevel.Informational, Keywords = Keywords.AsyncCausalitySynchronousWork)]
public void TraceSynchronousWorkBegin(int TaskID, CausalitySynchronousWork Work)
{
if (IsEnabled() && IsEnabled(EventLevel.Informational, Keywords.AsyncCausalitySynchronousWork))
WriteEvent(TRACESYNCHRONOUSWORKSTART_ID, TaskID, (int)Work); // optimized overload for this exists
}
[UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:UnrecognizedReflectionPattern",
Justification = EventSourceSuppressMessage)]
[Event(TRACESYNCHRONOUSWORKSTOP_ID, Version = 1,
Level = EventLevel.Informational, Keywords = Keywords.AsyncCausalitySynchronousWork)]
public void TraceSynchronousWorkEnd(CausalitySynchronousWork Work)
{
if (IsEnabled() && IsEnabled(EventLevel.Informational, Keywords.AsyncCausalitySynchronousWork))
{
unsafe
{
EventData* eventPayload = stackalloc EventData[1];
eventPayload[0].Size = sizeof(int);
eventPayload[0].DataPointer = ((IntPtr)(&Work));
eventPayload[0].Reserved = 0;
WriteEventCore(TRACESYNCHRONOUSWORKSTOP_ID, 1, eventPayload);
}
}
}
[NonEvent]
public unsafe void RunningContinuation(int TaskID, object Object) => RunningContinuation(TaskID, ObjectIDForEvents(Object));
[Event(20, Keywords = Keywords.Debug)]
private void RunningContinuation(int TaskID, long Object)
{
if (Debug)
WriteEvent(20, TaskID, Object);
}
[NonEvent]
public unsafe void RunningContinuationList(int TaskID, int Index, object Object) => RunningContinuationList(TaskID, Index, ObjectIDForEvents(Object));
[Event(21, Keywords = Keywords.Debug)]
public void RunningContinuationList(int TaskID, int Index, long Object)
{
if (Debug)
WriteEvent(21, TaskID, Index, Object);
}
[Event(23, Keywords = Keywords.Debug)]
public void DebugFacilityMessage(string Facility, string Message) { WriteEvent(23, Facility, Message); }
[Event(24, Keywords = Keywords.Debug)]
public void DebugFacilityMessage1(string Facility, string Message, string Value1) { WriteEvent(24, Facility, Message, Value1); }
[Event(25, Keywords = Keywords.DebugActivityId)]
public void SetActivityId(Guid NewId)
{
if (DebugActivityId)
WriteEvent(25, NewId);
}
[Event(26, Keywords = Keywords.Debug)]
public void NewID(int TaskID)
{
if (Debug)
WriteEvent(26, TaskID);
}
[NonEvent]
public void IncompleteAsyncMethod(IAsyncStateMachineBox stateMachineBox)
{
Diagnostics.Debug.Assert(stateMachineBox != null);
if (IsEnabled() && IsEnabled(EventLevel.Warning, Keywords.AsyncMethod))
{
IAsyncStateMachine stateMachine = stateMachineBox.GetStateMachineObject();
if (stateMachine != null)
{
string description = AsyncMethodBuilderCore.GetAsyncStateMachineDescription(stateMachine);
IncompleteAsyncMethod(description);
}
}
}
[Event(27, Level = EventLevel.Warning, Keywords = Keywords.AsyncMethod)]
private void IncompleteAsyncMethod(string stateMachineDescription) =>
WriteEvent(27, stateMachineDescription);
/// <summary>
/// Activity IDs are GUIDS but task IDS are integers (and are not unique across appdomains
/// This routine creates a process wide unique GUID given a task ID
/// </summary>
internal static Guid CreateGuidForTaskID(int taskID)
{
// The thread pool generated a process wide unique GUID from a task GUID by
// using the taskGuid, the appdomain ID, and 8 bytes of 'randomization' chosen by
// using the last 8 bytes as the provider GUID for this provider.
// These were generated by CreateGuid, and are reasonably random (and thus unlikely to collide
int pid = Environment.ProcessId;
return new Guid(taskID,
(short)DefaultAppDomainID, (short)(DefaultAppDomainID >> 16),
(byte)pid, (byte)(pid >> 8), (byte)(pid >> 16), (byte)(pid >> 24),
0xff, 0xdc, 0xd7, 0xb5);
}
}
}
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